S7 rejects incoming calls by tapping reject button


I've got an elderly Galaxy S7 running Android 8. When an incoming call arrives and the native phone app pops up the incoming call screen, the red reject call button only needs tapping to reject the call; it doesn't require swiping. This means that it's very easy to reject calls accidentally. I can't find a setting to change the button behaviour back to swipe. Does anyone know how I can stop this irritating behaviour?